CHILWA (incorrectly SHIawA) , '5° 15' S., 35° 40' E. ; a shallow lake of brackish water in the Nyasaland Protectorate abutting on Portuguese East Africa. Its area varies with the rainfall, but never exceeds zoo sq. miles. Formerly, at a period of higher level, the lake appears to have drained northward to the Lujenda branch of the Rovuma. There are four islands, one rising soo ft. above the water level. The lake was discovered by Livingstone in